Accuracy of day-to-day patient positioning in ocular proton therapy with a dedicated beamline.

ABSTRACT: The purpose of this study was to determine the residual patient positioning error of ocular proton treatment based on daily setup X-ray images and tantalum clips. The residual day-to-day patient positioning accuracy in a cohort of 60 patients and 240 fractions was determined in two steps. The 3D tantalum clips' positions in the orthogonal X-ray images just prior to aperture placement were registered with 3D clips' positions derived from the reference data from treatment planning. The aperture, placed before irradiation, reduced the field of view in axial images blocking clips partially or completely in most cases. The clips' positions after aperture placement in the lateral images were compared with the reference clips' positions. Partially visible clips in the axial image were registered

SUBMITTER: Hol M 

PROVIDER: S-EPMC12478952 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature